Beetles on a diet
Imagine a year or two of drought in which there are few plants a beetle can eat.
First generation of starving beetles
All the beetles have the same chances of survival and reproduction, but because of food restrictions, the beetles in the population are a little smaller than the preceding generation of beetles.
Second generation of starving beetles
Beetles of a different color
Most of the beetles in the population (say 90%) have the genes for bright green coloration and a few of them (10%) have a gene that makes them more brown.
Second generation of starving beetles
Some number of generations later, things have changed: brown beetles are more common than they used to be and make up 70% of the population.
Second Generation
Image credits: University of California Museum of Paleontology's Understanding Evolution (http://evolution. berkeley. edu).
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Beetles on a diet
Imagine a year or two of drought in which there are few plants a beetle can eat.<...
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